Silicon ValleyWhen are property taxes due in Silicon Valley?

Silicon Valley is not a governmental area, like the City of San Jose or San Mateo County.  Silicon Valley includes virtually all of Santa Clara County, most of San Mateo County, and parts of Alameda County and Santa Cruz County. Property taxes, or real estate taxes, are paid to whichever California county the home or land is located.  Luckily, all four of these counties work off the same basic set of dates.

Fiscal year for real estate taxes and due dates:

The fiscal year for the county tax assessor’s office begins July 1st.  Property taxes are billed in two installments.  The first one covers July 1st to December 31st, and the second one begins with January 1st and runs through the last day of June.

  • The property tax bill for the first installment is due November 1st and is late if not paid (or postmarked) by December 10th at 5pm.
  • The second installment of real estate taxes is due February 1st and is late if payment is not received or postmarked by April 10th at 5pm.  (This one fools people because U.S. income taxes are due April 15th, so be extra careful!)

Should the delinquent date fall on a weekend or holiday, the deadline falls to 5pm the next business day.

What happens if the payment is late?

If your payment is late, there’s a 10% penalty (and an administrative fee may be charged for processing the late payment as well).  If taxes aren’t paid by the end of the fiscal year, the property is then “in default”.   Eventually, if the tax isn’t paid, the home may be foreclosed on by the tax assessor’s office, though ordinarily this may take years and the owner’s credit can be damaged significantly in the process.

Other dates to know

Property taxes are mailed in September and October and should arrive before November 1st.

Property tax bills become a lein January 1st.  Don’t be offended, it’s just a bill that is always due!

January 1st is also the assessment date, meaning that is the date when the county tax assessor’s office figures out the taxable value of your condo, townhouse, house, multiplex, etc.   When you get your assessment, it’s the perceived value as of January 1st that year.

Supplemental taxes

If you just bought your home, the tax rate applied at closing was the former owner’s rate, which normally will be lower than the new rate due.  A few months later, when everyone has forgotten about it, a Supplemental Tax Bill comes in the mail.  That’s a one-time “catch up” bill and after that you’ll get taxed at the rate you should have been since you bought, which is appx 1.25% of the purchase price for the first year. After the first year, taxes can rise only 2% per year from that initial value*, even if the home appreciates much more.  (This situation inclines people not to sell and is part of the reason for our housing shortage.)

This is Silicon Valley and really we ought to be able to get that calculated at closing, but for some reason, the systems in place cannot seem to muster it.

*If there’s a decline in value such as we saw in The Great Recession, people may appeal their assessed rate and get a lower tax rate.  When values rise again, the 2% constraints will not be in place as such.  Real estate property taxes can jump up a lot, but not more than if they had been climbing 2% per year during the correction.

View what’s on the market in Santa Clara County through the map below:

  1. 4 beds, 2 baths
    Home size: 1,285 sq ft
    Lot size: 6,028 sqft
  2. 2 beds, 1 bath
    Home size: 651 sq ft
    Lot size: 7,627 sqft
  3. 0 beds, 0 bath
    Home size: 1,275 sq ft
    Lot size: 5,031 sqft
  4. 2 beds, 2 baths
    Home size: 1,267 sq ft
    Lot size: 3,615 sqft
  5. 4 beds, 3 baths
    Home size: 1,564 sq ft
    Lot size: 723 sqft
  6. 2 beds, 2 baths
    Home size: 937 sq ft
    Lot size: 5,501 sqft
  7. 3 beds, 2 baths
    Home size: 1,489 sq ft
    Lot size: 5,998 sqft
  8. 1 bed, 1 bath
    Home size: 716 sq ft
    Lot size: 614 sqft
  9. 3 beds, 2 baths
    Home size: 1,421 sq ft
    Lot size: 6,669 sqft
  10. 4 beds, 3 baths
    Home size: 2,268 sq ft
    Lot size: 9,151 sqft

See all Real estate in the city of Santa Clara.
(all data current as of 3/23/2018)

Listing information deemed reliable but not guaranteed. Read full disclaimer.


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Mary Pope-Handy
Sereno Group Real Estate
214 Los Gatos-Saratoga Rd
Los Gatos, CA 95030
408 204-7673
Mary (at)
License# 01153805

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Special focus on:
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